I am having the same issue with Windows 8.1. Was running Migration v2.4.3.1 but it couldn't find my Mac. Unfortunately, I downloaded the latest version and that was it, it wouldn't open. The error says it is only for Windows 10. I then uninstalled and downloaded the previous version and that did not work either. Uninstalled again and downloaded original version 2.4.3.1 but now it won't open at all. I have restored my PC to a previous restore point from 2 days ago and nothing works. I have wasted over 3 hours on this already! Extremely frustrating!!!